<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            padding: 0;
            margin: 0;
        }

        header {
            background: #000;
            height: 44px;
            padding: 0 18px;
        }

        #toggler {
            display: none;
        }

        #toggler:checked+label .hamburger-container span:nth-child(1) {
            transform: rotate(45deg);
            top: 4px;
            transition: top 0.3s ease-in-out, transform .3s ease-in-out .3s;
        }

        #toggler:checked+label .hamburger-container span:nth-child(2) {
            transform: rotate(-45deg);
            top: -4px;
            transition: top 0.3s ease-in-out, transform .3s ease-in-out .3s;
        }

        .hamburger-container {
            width: 20px;
            height: 20px;
            position: relative;
            top: 16px;
        }

        .hamburger-container span {
            display: block;
            height: 1px;
            background: #fff;
            position: relative;
            transition: transform 0.3s ease-in-out, top .3s ease-in-out .3s;
            top: 0;
        }

        .hamburger-container span:nth-child(2) {
            margin-top: 7px;
        }

        .nav-items {
            background: rgba(0, 0, 0, .82);
            width: 100%;
            height: 100vh;
            position: absolute;
            top: 44px;
            left: 0;
            transform: scaleY(0);
            transition: transform .3s ease-in-out, opacity .3s ease-in-out .3s;
            transform-origin: 50% 0;
            /* 设置透明度可以达到渐入和渐出的效果 */
            opacity: 0;
        }

        .nav-items ul {
            margin-top: 1em;
        }

        .nav-items ul li {
            color: #fff;
        }

        #toggler:checked~.nav-items {
            transform: scaleY(1);
            opacity: 1;
        }
    </style>
</head>

<body>
    <header>
        <input type="checkbox" id="toggler">
        <label for="toggler">
            <div class="hamburger-container">
                <span></span>
                <span></span>
            </div>
        </label>
        <div class="nav-items">
            <ul>
                <li>Home</li>
                <li>iPhone</li>
                <li>iPad</li>
                <li>Mac</li>
                <li>TV</li>
            </ul>
        </div>
    </header>
</body>

</html>